EXPRESS: Sonoluminescence Spectroscopy Application to Analysis of Industrially Used Highly Concentrated Aqueous Solutions of Alkali Metal Chlorides

The use of the sonoluminescence spectroscopy for the determination of main components in concentrated aqueous solution of alkali metal halides is examined. In concentrated RCl-solutions (R=Li, Na, K; C=100–600 g•dm–3) the sonoluminescence intensity is inversely proportional to ultrasound frequency in the range from 2 МHz up to 5 МHz. In the CsCl case the inverse proportionality is disturbed at ultrasound frequencies higher than 3 MHz. This is the limiting value for the accurate analysis of the concentrated solutions of cesium chloride. The increase of initiating ultrasound frequency leads to the decreasing of sensibility of the main component determination in highly concentrated (more than 300 g∙dm–3) natural and technological solutions. Nevertheless, the metrological characteristics of the results of the main substance determination in these solutions improve. The routines of express determination of the main substance in concentrated saline solutions were developed.

The use of pharmacological blockades in the complex treatment of lumbosacral radiculoischemia in patients with discs hernias of large sizes

Introduction. Lumbosacral dorsalgia is widespread and represents an actual problem. The greatest difficulties are noted in the treatment of patients with discs hernias of large size. Local injection therapy is actively used. The development of therapeutic methods in such patients remains relevant.The goal of research is to compare the effectiveness of pharmacological blockade in the complex treatment of spondylogenic lumbosacral radiculoischemia in patients with discs hernias of large size.Materials and methods. A prospective randomized controlled trial was conducted in March-November 2018 at the Neurological Department No. 2 of the Institute of neurology of the Pavlov First Saint Petersburg State Medical University. There were 58 patients with symptoms of lumbosacral radiculoischemia with discs hernias of large sizes. Depending on the used treatment method, the patients were divided into main and control groups. Each patient had 10 sessions of manual therapy lasting 20 minutes each. Sessions were held daily. Preformed physical factors were also used in all the observed patients. Preference was given to low-intensity laser therapy, the number of procedures was 10–15 with an interval on weekends, and the total duration of irradiation was no more than 20 minutes. Additionally, patients in the main group received local injections of diprospan and lidocaine, and patients in the control group received injections without the main substance. The intensity of pain was assessed by visual analog scale during the first day, as well as its intensity by the McGill questionnaire during 14 days.Results. The study included 24 men and 34 women with signs of compression radiculoishemias with discs hernias of large sizes. The level is lumbosacral (LIV–V, LV –SI ). When evaluating the data in the first hours and within 2 weeks, a significant decrease in the severity of pain syndrome was observed in comparison with the initial results in patients of both groups (p<0,05). The obsered data (pain intensity) significantly differed after 2 and 6 hours (p<0,001), as well as during 4, 7, and 8 days (p<0,01). The use of medication blocks with glucocorticoids has a more significant effect compared to the treatment regimen without the main substance (group 2) for 8–9 h (p<0,05) and 7-day treatment period (p<0,01).Conclusion. The medication blockades with glucocorticosteroids included in the complex treatment of patients with spondylogenic radiculoishemias with discs hernias of large sizes have a significantly more significant analgesic effect, while the effect is achieved in a short time. When using local injections with diprospan and lidocaine, the therapeutic effect appears gradually, and it persists for a long time — up to 2 weeks. The recommended number of injections is no more than 3 per course of treatment.

The method of purification of N-cyclohexyl maleimide - comonomer for heat-resistant optical methacrylic copolymers

Experimental evaluation of various methods for the synthesis of purified N-cyclohexylmaleimide was carried out. It was shown that the monomer obtained by the combined purification scheme, including steam distillation and sequential recrystallization in organic solvents of diff erent polarities, allows to obtain N-cyclohexylmaleimide with the content of the main substance of at least 99.5 wt.% and with a yield of 70–80 wt.%.The monomer synthesized according to the proposed scheme does not contain polymerization-active and coloring impurities. It makes it possible to obtain unpainted methacrylic copolymers on its base with high heat resistance.

The future of capitalism: Trends, scenarios and prospects for the future

The article provides a framework for thinking about how the question of the future of capitalism might be addressed. One of the problems resides in the very definition of capitalism and of what its defining features consist of and whether we should be talking about ‘capitalist society’ or the ‘capitalist economy’ or some kind of post-capitalist condition. Following Polanyi, Castoriadis and Habermas, it is argued that capitalism and democracy together constitute the defining dynamics of modernity and that the resulting tensions will provide momentum for the main circuits of potential change. Five scenarios for looking at the future are discussed. These will form the main substance of the article: varieties of capitalism, systemic crises of capitalism, catastrophic collapse, low growth capitalism and post-capitalism. In conclusion, it is argued that there are various possibilities that can be understood in terms of transitions, breakdown or transformation, but a likely future trend will be less the end of capitalism than the harnessing of ‘super-capitalism’ and that there are limits to the accumulation of capital.

Hydrofluoride Method of Complex Processing of Titanium-Containing Raw Materials

The use of titanium dioxide is so diverse that varies from food to heavy industry and it is the main substance in the titanium industry. Over 90% of the world's mined titanium concentrates are processed to produce pigments. The sources for the production of titanium dioxide are the typically used titanium-containing ores including minerals rutile, ilmenite, and others. The volume of world production of titanium dioxide pigment exceeds 5 million tons per year and it is carried out in two ways: sulphate and chlorine (in approximately equal volumes). The changed approach to the green production processes requires the improvement of existing technologies and the development of new methods for processing titanium-containing raw materials. The authors have experimentally confirmed the high efficiency of complex, waste-free processing of titanium-containing raw materials developed by hydrofluoride. Creating pigment production on the basis hydrofluoride method will meet not only the domestic needs but also offer thepigment for export, as its parameters will surpass those of the best world analogues.

Pengaruh Lama Waktu Pengadukan Terhadap Pengikatan Impuritis untuk Meningkatkan Kadar NaCl Pada Garam Rakyat

ABSTRAKGaram dapat didefinisikan sebagai suatu kumpulan senyawa kimia yang bagian utamanya adalah Natrium Chlorida (NaCl) dengan zat-zat pengotor terdiri dari MgCl2, MgSO4, CaSO4, dan lain-lain. Dalam penelitian ini digunakan sampel garam rakyat dari Pasar Larangan Sidoarjo yang memiliki kualitas dibawah standar, dengan kadar NaCl 81,88% b/b. Oleh karena itu, diperlukan pemurnian garam dengan menggunakan metode rekristalisasi. Penelitian ini dilakukan untuk mengetahui pengaruh lama waktu pengadukan (15, 30, dan 45menit) terhadap penambahan beberapa senyawa kimia, seperti natrium hidroksida (NaOH), natrium karbonat (Na2CO3) dan barium klorida (BaCl2) untuk mengurangi ion polutan (Ca2+, Mg2+ dan SO42-). Sehingga kadar NaCl dalam garam rakyat akan meningkat. Kadar NaCl dihitung sebelum dan setelah diberi perlakuan dengan menggunakan metode titrasi argentometri. Hasil penelitian menunjukkan bahwa kadar NaCl tertinggi diperoleh pada rekristalisasi dengan lama waktu pengadukan 45 menit, dengan kadar 98,86% b/b. Kemurnian ini sesuai untuk memenuhi tuntutan kebutuhan masyarakat dan industri.Kata Kunci: Garam Rakyat, Kadar NaCl, Lama Waktu PengadukanABSTRACTSalt can be defined as chemical compounds which the main substance is Sodium Chloride (NaCl) with impurity substances consist of MgCl2, MgSO4, CaSO4, etc. This study used public salt from Larangan Market Sidoarjo which has sub-standard quality, and the concentration of NaCl is about 81,88%b/b. Hence, salt purification is needed using recrystallization method. This study was conducted to determine the influence of stirring time (15, 30, and 45 minutes) of the addition of several chemical compounds, such as sodium hydroxide (NaOH), sodiumcarbonate (Na2CO3) and barium chloride (BaCl2) in order to reduce the pollutant ions (Ca2+, Mg2+ and SO42-). Eventually the percentage of NaCl concentration in public salt will increase. NaCl concentration was calculated before and after treatment was using argentometry titration. The results shows that the highest NaCl concentration is obtained at recrystallization with stirring time 45 minutes, concentration 98,86% b/b. This purity suitable to meet the needs of society and industry demands.Keywords: Stirring Time, The Concentration Of NaCl, Public Salt.

Comparison of Fibroarchitectonics and Strength Properties Preservation Criteria of Lyophilized Allografts with Different Type of Fibrous Framework

An overall estimation of the structure and strength properties of lyophilized connective tissue allografts from 73 cadavers of both sexes, aged from 20 to 50, was performed. Criteria for preservation of their fibroarchitectonics depending upon the type of the connective tissue fibrous framework and presence of the main substance were determined. It was shown that lyophilization process was accompanied by changes in architectonics and reduction of strength properties in allografts made of dense formed connective tissue with orientated (Achilles tendon) and mixed (dura mater, broad fascia) type of fibrous framework. A spatial non-orientated type of derma fibrous framework in weight bearing foot segments stipulated preservation of architectonics and plastic properties after lyophilization.